Re: Eris - Pluto for Lua 5.2

[Florian Nücke <florian@...>]

> As far as I remember, CallInfo.extra is used in two contexts. While
> a function invocation is suspended (L->status == LUA_YIELD), the
> field L->ci->extra keeps the original value for L->ci->func, because
> L->ci->func has to change to "simulate" a new activation record
> for whoever manipulates the suspended thread.
>
> For a CallInfo that refers to a yieldable protected call
> (ci->callstatus & CIST_YPCALL), ci->extra keeps the level
> of the function being called, which is the level to restore
> the stack in case of an error.
>
> -- Roberto

Brilliant, thanks for the quick reply. I've added context sensitive
persisting and validation based on this, and at least the test cases
still pass. Time will tell if I made a wrong assumption somewhere.

Thanks again,
Florian